The
Main Liquid Pressure Differential
Solenoid Valve
(MS) functions during Koolgas
defrost to reduce pressure to the Liquid Manifold.
This valve never closes completely but restricts
the liquid line, reducing the pressure in the liquid
manifold, thus enabling the reverse flow of refrig-
erant necessary for Koolgas Defrost.
The
Liquid Manifold
distributes liquid refriger-
ant to all the Branches Liquid Lines connected.
The
Branch Liquid Line Solenoid Valve
(S_)
closes off refrigeration liquid supply to the expan-
sion valve, yet allows back flow of refrigerant into
the liquid manifold during defrost.
The
Expansion Valve
, located in the merchan-
diser, meters liquid refrigerant through its orifice
to the low pressure side of the system. As the
refrigerant passes through the evaporator coil it
absorbs heat from the coil and flashes into vapor.
An
Evaporator Pressure Regulating Valve
may
be used to control the evaporator temperature by
preventing the evaporator pressure from dropping
below a set point.
At critical locations along the refrigerant path,
service valves or ball valves allow isolation of
components.
September 1, 1997
P/N 401789
2 - 5
Alco
Sporlan
MS
Figure 2-6 — Main Liquid Line
Pressure Differential Valve
Figure 2-9 EPR Valve
EPR
Figure 2-9 — EPR Valve
S_
Fi
2 8 TEV
HUSSM ANN CORPORATION • BRIDGETON, M O 63044-2483 • Printed in USA
Figure 2-7 — Branch Liquid Line
Solenoid Valve
Figure 2-8 — TEV
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